From my experience with MEC Panniers I would recommend them. They are nearly industructable and even if something does go wrong they are good about repairs and returns. My only problem is that the hooks which came with them aren't long enough so I had to buy extra long ones. MEC products would have been an amazing deal with the exchange rate years back.
I've had my MEC panniers for twelve years, and they still work great. Last year, when I bought my recumbent, I had to exchange the original hooks for the ones in the picture you provided, because the original hooks wouldn't fit on the larger tube of the new rack. I've used them on two tours so far without problem.
Base of the Rocky Mountains, Canada. Wonderous things!
2010 Cannondale Hooligan 3
MEC panniers are very good for the price. I've been using a pair handed down to me from my sister which are now in their teens, and just bought another set for the front of the bike lately, the new ones look to be even better.
As for the hooks, they're a lot more robust than they look in the picture and hold up very well. You may need a replacement hook kit if your rack is thicker than average, or you may need new bottom hooks if your rack is too tall for those ones. MEC has both types available, so there's no fuss over finding a fix if you do encounter a problem.
They're not as fancy as some other offerings, but they serve quite well.
Anyone else have problems with the SNAP at the bottom (to hold the two together when off bike)? It's in a ridiculous spot, flicks in the spokes constantly. Need a solution or a return.
I know what you mean about it being close to the spokes. I just tuck mine back behind the compression strap. Seems to do the trick. I have also considered just cutting off. To each their own I guess, but I don't use mine nearly often enough to consider it being an issue I would return them over.